content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.flowable.internal.operators;
  
  import static org.junit.Assert.*;
  import static org.mockito.ArgumentMatchers.*;
  import static org.mockito.Mockito.*;
  
  import java.util.*;
  import java.util.concurrent.*;
  import java.util.concurrent.atomic.*;
  
  import org.junit.Test;
  import org.mockito.InOrder;
  import org.reactivestreams.*;
  
  import hu.akarnokd.reactivestreams.extensions.*;
  import io.reactivex.common.*;
  import io.reactivex.common.annotations.Nullable;
  import io.reactivex.common.exceptions.*;
  import io.reactivex.common.functions.*;
  import io.reactivex.common.internal.functions.Functions;
  import io.reactivex.common.internal.schedulers.ImmediateThinScheduler;
  import io.reactivex.flowable.*;
  import io.reactivex.flowable.internal.operators.FlowableObserveOn.BaseObserveOnSubscriber;
  import io.reactivex.flowable.internal.subscriptions.BooleanSubscription;
  import io.reactivex.flowable.processors.*;
  import io.reactivex.flowable.subscribers.*;
  
  public class FlowableObserveOnTest {
  
      /**
       * This is testing a no-op path since it uses Schedulers.immediate() which will not do scheduling.
       */
      @Test
      public void testObserveOn() {
          Subscriber<Integer> observer = TestHelper.mockSubscriber();
          Flowable.just(1, 2, 3).observeOn(ImmediateThinScheduler.INSTANCE).subscribe(observer);
  
          verify(observer, times(1)).onNext(1);
          verify(observer, times(1)).onNext(2);
          verify(observer, times(1)).onNext(3);
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void testOrdering() throws InterruptedException {
  //        Flowable<String> obs = Flowable.just("one", null, "two", "three", "four");
          // FIXME null values not allowed
          Flowable<String> obs = Flowable.just("one", "null", "two", "three", "four");
  
          Subscriber<String> observer = TestHelper.mockSubscriber();
  
          InOrder inOrder = inOrder(observer);
          TestSubscriber<String> ts = new TestSubscriber<String>(observer);
  
          obs.observeOn(Schedulers.computation()).subscribe(ts);
  
          ts.awaitTerminalEvent(1000, TimeUnit.MILLISECONDS);
          if (ts.errors().size() > 0) {
              for (Throwable t : ts.errors()) {
                  t.printStackTrace();
              }
              fail("failed with exception");
          }
  
          inOrder.verify(observer, times(1)).onNext("one");
          inOrder.verify(observer, times(1)).onNext("null");
          inOrder.verify(observer, times(1)).onNext("two");
          inOrder.verify(observer, times(1)).onNext("three");
          inOrder.verify(observer, times(1)).onNext("four");
          inOrder.verify(observer, times(1)).onComplete();
          inOrder.verifyNoMoreInteractions();
      }
  
      @Test
      public void testThreadName() throws InterruptedException {
          System.out.println("Main Thread: " + Thread.currentThread().getName());
          // FIXME null values not allowed
  //        Flowable<String> obs = Flowable.just("one", null, "two", "three", "four");
          Flowable<String> obs = Flowable.just("one", "null", "two", "three", "four");
  
          Subscriber<String> observer = TestHelper.mockSubscriber();
          final String parentThreadName = Thread.currentThread().getName();
  
          final CountDownLatch completedLatch = new CountDownLatch(1);
  
          // assert subscribe is on main thread
          obs = obs.doOnNext(new Consumer<String>() {
  
              @Override
              public void accept(String s) {
                  String threadName = Thread.currentThread().getName();
                  System.out.println("Source ThreadName: " + threadName + "  Expected => " + parentThreadName);
                  assertEquals(parentThreadName, threadName);
              }
  
          });
  
          // assert observe is on new thread
          obs.observeOn(Schedulers.newThread()).doOnNext(new Consumer<String>() {
  
              @Override
              public void accept(String t1) {
                  String threadName = Thread.currentThread().getName();
                  boolean correctThreadName = threadName.startsWith("RxNewThreadScheduler");
                  System.out.println("ObserveOn ThreadName: " + threadName + "  Correct => " + correctThreadName);
                  assertTrue(correctThreadName);
              }
  
          }).doAfterTerminate(new Action() {
  
              @Override
              public void run() {
                  completedLatch.countDown();
  
              }
          }).subscribe(observer);
  
          if (!completedLatch.await(1000, TimeUnit.MILLISECONDS)) {
              fail("timed out waiting");
          }
  
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(5)).onNext(any(String.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void observeOnTheSameSchedulerTwice() {
          Scheduler scheduler = ImmediateThinScheduler.INSTANCE;
  
          Flowable<Integer> o = Flowable.just(1, 2, 3);
          Flowable<Integer> o2 = o.observeOn(scheduler);
  
          Subscriber<Object> observer1 = TestHelper.mockSubscriber();
          Subscriber<Object> observer2 = TestHelper.mockSubscriber();
  
          InOrder inOrder1 = inOrder(observer1);
          InOrder inOrder2 = inOrder(observer2);
  
          o2.subscribe(observer1);
          o2.subscribe(observer2);
  
          inOrder1.verify(observer1, times(1)).onNext(1);
          inOrder1.verify(observer1, times(1)).onNext(2);
          inOrder1.verify(observer1, times(1)).onNext(3);
          inOrder1.verify(observer1, times(1)).onComplete();
          verify(observer1, never()).onError(any(Throwable.class));
          inOrder1.verifyNoMoreInteractions();
  
          inOrder2.verify(observer2, times(1)).onNext(1);
          inOrder2.verify(observer2, times(1)).onNext(2);
          inOrder2.verify(observer2, times(1)).onNext(3);
          inOrder2.verify(observer2, times(1)).onComplete();
          verify(observer2, never()).onError(any(Throwable.class));
          inOrder2.verifyNoMoreInteractions();
      }
  
      @Test
      public void observeSameOnMultipleSchedulers() {
          TestScheduler scheduler1 = new TestScheduler();
          TestScheduler scheduler2 = new TestScheduler();
  
          Flowable<Integer> o = Flowable.just(1, 2, 3);
          Flowable<Integer> o1 = o.observeOn(scheduler1);
          Flowable<Integer> o2 = o.observeOn(scheduler2);
  
          Subscriber<Object> observer1 = TestHelper.mockSubscriber();
          Subscriber<Object> observer2 = TestHelper.mockSubscriber();
  
          InOrder inOrder1 = inOrder(observer1);
          InOrder inOrder2 = inOrder(observer2);
  
          o1.subscribe(observer1);
          o2.subscribe(observer2);
  
          scheduler1.advanceTimeBy(1, TimeUnit.SECONDS);
          scheduler2.advanceTimeBy(1, TimeUnit.SECONDS);
  
          inOrder1.verify(observer1, times(1)).onNext(1);
          inOrder1.verify(observer1, times(1)).onNext(2);
          inOrder1.verify(observer1, times(1)).onNext(3);
          inOrder1.verify(observer1, times(1)).onComplete();
          verify(observer1, never()).onError(any(Throwable.class));
          inOrder1.verifyNoMoreInteractions();
  
          inOrder2.verify(observer2, times(1)).onNext(1);
          inOrder2.verify(observer2, times(1)).onNext(2);
          inOrder2.verify(observer2, times(1)).onNext(3);
          inOrder2.verify(observer2, times(1)).onComplete();
          verify(observer2, never()).onError(any(Throwable.class));
          inOrder2.verifyNoMoreInteractions();
      }
  
      /**
       * Confirm that running on a NewThreadScheduler uses the same thread for the entire stream.
       */
      @Test
      public void testObserveOnWithNewThreadScheduler() {
          final AtomicInteger count = new AtomicInteger();
          final int _multiple = 99;
  
          Flowable.range(1, 100000).map(new Function<Integer, Integer>() {
  
              @Override
              public Integer apply(Integer t1) {
                  return t1 * _multiple;
              }
  
          }).observeOn(Schedulers.newThread())
          .blockingForEach(new Consumer<Integer>() {
  
              @Override
              public void accept(Integer t1) {
                  assertEquals(count.incrementAndGet() * _multiple, t1.intValue());
                  // FIXME toBlocking methods run on the current thread
                  String name = Thread.currentThread().getName();
                  assertFalse("Wrong thread name: " + name, name.startsWith("Rx"));
              }
  
          });
  
      }
  
      /**
       * Confirm that running on a ThreadPoolScheduler allows multiple threads but is still ordered.
       */
      @Test
      public void testObserveOnWithThreadPoolScheduler() {
          final AtomicInteger count = new AtomicInteger();
          final int _multiple = 99;
  
          Flowable.range(1, 100000).map(new Function<Integer, Integer>() {
  
              @Override
              public Integer apply(Integer t1) {
                  return t1 * _multiple;
              }
  
          }).observeOn(Schedulers.computation())
          .blockingForEach(new Consumer<Integer>() {
  
              @Override
              public void accept(Integer t1) {
                  assertEquals(count.incrementAndGet() * _multiple, t1.intValue());
                  // FIXME toBlocking methods run on the caller's thread
                  String name = Thread.currentThread().getName();
                  assertFalse("Wrong thread name: " + name, name.startsWith("Rx"));
              }
  
          });
      }
  
      /**
       * Attempts to confirm that when pauses exist between events, the ScheduledObserver
       * does not lose or reorder any events since the scheduler will not block, but will
       * be re-scheduled when it receives new events after each pause.
       *
       *
       * This is non-deterministic in proving success, but if it ever fails (non-deterministically)
       * it is a sign of potential issues as thread-races and scheduling should not affect output.
       */
      @Test
      public void testObserveOnOrderingConcurrency() {
          final AtomicInteger count = new AtomicInteger();
          final int _multiple = 99;
  
          Flowable.range(1, 10000).map(new Function<Integer, Integer>() {
  
              @Override
              public Integer apply(Integer t1) {
                  if (randomIntFrom0to100() > 98) {
                      try {
                          Thread.sleep(2);
                      } catch (InterruptedException e) {
                          e.printStackTrace();
                      }
                  }
                  return t1 * _multiple;
              }
  
          }).observeOn(Schedulers.computation())
          .blockingForEach(new Consumer<Integer>() {
  
              @Override
              public void accept(Integer t1) {
                  assertEquals(count.incrementAndGet() * _multiple, t1.intValue());
  //                assertTrue(name.startsWith("RxComputationThreadPool"));
                  // FIXME toBlocking now runs its methods on the caller thread
                  String name = Thread.currentThread().getName();
                  assertFalse("Wrong thread name: " + name, name.startsWith("Rx"));
              }
  
          });
      }
  
      @Test
      public void testNonBlockingOuterWhileBlockingOnNext() throws InterruptedException {
  
          final CountDownLatch completedLatch = new CountDownLatch(1);
          final CountDownLatch nextLatch = new CountDownLatch(1);
          final AtomicLong completeTime = new AtomicLong();
          // use subscribeOn to make async, observeOn to move
          Flowable.range(1, 2).subscribeOn(Schedulers.newThread()).observeOn(Schedulers.newThread()).subscribe(new DefaultSubscriber<Integer>() {
  
              @Override
              public void onComplete() {
                  System.out.println("onComplete");
                  completeTime.set(System.nanoTime());
                  completedLatch.countDown();
              }
  
              @Override
              public void onError(Throwable e) {
  
              }
  
              @Override
              public void onNext(Integer t) {
                  // don't let this thing finish yet
                  try {
                      if (!nextLatch.await(1000, TimeUnit.MILLISECONDS)) {
                          throw new RuntimeException("it shouldn't have timed out");
                      }
                  } catch (InterruptedException e) {
                      throw new RuntimeException("it shouldn't have failed");
                  }
              }
  
          });
  
          long afterSubscribeTime = System.nanoTime();
          System.out.println("After subscribe: " + completedLatch.getCount());
          assertEquals(1, completedLatch.getCount());
          nextLatch.countDown();
          completedLatch.await(1000, TimeUnit.MILLISECONDS);
          assertTrue(completeTime.get() > afterSubscribeTime);
          System.out.println("onComplete nanos after subscribe: " + (completeTime.get() - afterSubscribeTime));
      }
  
      private static int randomIntFrom0to100() {
          // XORShift instead of Math.random http://javamex.com/tutorials/random_numbers/xorshift.shtml
          long x = System.nanoTime();
          x ^= (x << 21);
          x ^= (x >>> 35);
          x ^= (x << 4);
          return Math.abs((int) x % 100);
      }
  
      @Test
      public void testDelayedErrorDeliveryWhenSafeSubscriberUnsubscribes() {
          TestScheduler testScheduler = new TestScheduler();
  
          Flowable<Integer> source = Flowable.concat(Flowable.<Integer> error(new TestException()), Flowable.just(1));
  
          @SuppressWarnings("unchecked")
          DefaultSubscriber<Integer> o = mock(DefaultSubscriber.class);
          InOrder inOrder = inOrder(o);
  
          source.observeOn(testScheduler).subscribe(o);
  
          inOrder.verify(o, never()).onError(any(TestException.class));
  
          testScheduler.advanceTimeBy(1, TimeUnit.SECONDS);
  
          inOrder.verify(o).onError(any(TestException.class));
          inOrder.verify(o, never()).onNext(anyInt());
          inOrder.verify(o, never()).onComplete();
      }
  
      @Test
      public void testAfterUnsubscribeCalledThenObserverOnNextNeverCalled() {
          final TestScheduler testScheduler = new TestScheduler();
  
          final Subscriber<Integer> observer = TestHelper.mockSubscriber();
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>(observer);
  
          Flowable.just(1, 2, 3)
                  .observeOn(testScheduler)
                  .subscribe(ts);
  
          ts.dispose();
          testScheduler.advanceTimeBy(1, TimeUnit.SECONDS);
  
          final InOrder inOrder = inOrder(observer);
  
          inOrder.verify(observer, never()).onNext(anyInt());
          inOrder.verify(observer, never()).onError(any(Exception.class));
          inOrder.verify(observer, never()).onComplete();
      }
  
      @Test
      public void testBackpressureWithTakeAfter() {
          final AtomicInteger generated = new AtomicInteger();
          Flowable<Integer> flowable = Flowable.fromIterable(new Iterable<Integer>() {
              @Override
              public Iterator<Integer> iterator() {
                  return new Iterator<Integer>() {
  
                      @Override
                      public void remove() {
                      }
  
                      @Override
                      public Integer next() {
                          return generated.getAndIncrement();
                      }
  
                      @Override
                      public boolean hasNext() {
                          return true;
                      }
                  };
              }
          });
  
          TestSubscriber<Integer> testSubscriber = new TestSubscriber<Integer>() {
              @Override
              public void onNext(Integer t) {
                  System.err.println("c t = " + t + " thread " + Thread.currentThread());
                  super.onNext(t);
                  try {
                      Thread.sleep(10);
                  } catch (InterruptedException e) {
                  }
              }
          };
  
          flowable
                  .observeOn(Schedulers.newThread())
                  .take(3)
                  .subscribe(testSubscriber);
          testSubscriber.awaitTerminalEvent();
          System.err.println(testSubscriber.values());
          testSubscriber.assertValues(0, 1, 2);
          // it should be between the take num and requested batch size across the async boundary
          System.out.println("Generated: " + generated.get());
          assertTrue(generated.get() >= 3 && generated.get() <= Flowable.bufferSize());
      }
  
      @Test
      public void testBackpressureWithTakeAfterAndMultipleBatches() {
          int numForBatches = Flowable.bufferSize() * 3 + 1; // should be 4 batches == ((3*n)+1) items
          final AtomicInteger generated = new AtomicInteger();
          Flowable<Integer> flowable = Flowable.fromIterable(new Iterable<Integer>() {
              @Override
              public Iterator<Integer> iterator() {
                  return new Iterator<Integer>() {
  
                      @Override
                      public void remove() {
                      }
  
                      @Override
                      public Integer next() {
                          return generated.getAndIncrement();
                      }
  
                      @Override
                      public boolean hasNext() {
                          return true;
                      }
                  };
              }
          });
  
          TestSubscriber<Integer> testSubscriber = new TestSubscriber<Integer>() {
              @Override
              public void onNext(Integer t) {
                  //                System.err.println("c t = " + t + " thread " + Thread.currentThread());
                  super.onNext(t);
              }
          };
  
          flowable
                  .observeOn(Schedulers.newThread())
                  .take(numForBatches)
                  .subscribe(testSubscriber);
          testSubscriber.awaitTerminalEvent();
          System.err.println(testSubscriber.values());
          // it should be between the take num and requested batch size across the async boundary
          System.out.println("Generated: " + generated.get());
          assertTrue(generated.get() >= numForBatches && generated.get() <= numForBatches + Flowable.bufferSize());
      }
  
      @Test
      public void testBackpressureWithTakeBefore() {
          final AtomicInteger generated = new AtomicInteger();
          Flowable<Integer> flowable = Flowable.fromIterable(new Iterable<Integer>() {
              @Override
              public Iterator<Integer> iterator() {
                  return new Iterator<Integer>() {
  
                      @Override
                      public void remove() {
                      }
  
                      @Override
                      public Integer next() {
                          return generated.getAndIncrement();
                      }
  
                      @Override
                      public boolean hasNext() {
                          return true;
                      }
                  };
              }
          });
  
          TestSubscriber<Integer> testSubscriber = new TestSubscriber<Integer>();
          flowable
                  .take(7)
                  .observeOn(Schedulers.newThread())
                  .subscribe(testSubscriber);
  
          testSubscriber.awaitTerminalEvent();
          testSubscriber.assertValues(0, 1, 2, 3, 4, 5, 6);
          assertEquals(7, generated.get());
      }
  
      @Test
      public void testQueueFullEmitsError() {
          final CountDownLatch latch = new CountDownLatch(1);
          Flowable<Integer> flowable = Flowable.unsafeCreate(new Publisher<Integer>() {
  
              @Override
              public void subscribe(Subscriber<? super Integer> o) {
                  o.onSubscribe(new BooleanSubscription());
                  for (int i = 0; i < Flowable.bufferSize() + 10; i++) {
                      o.onNext(i);
                  }
                  latch.countDown();
                  o.onComplete();
              }
  
          });
  
          TestSubscriber<Integer> testSubscriber = new TestSubscriber<Integer>(new DefaultSubscriber<Integer>() {
  
              @Override
              public void onComplete() {
  
              }
  
              @Override
              public void onError(Throwable e) {
  
              }
  
              @Override
              public void onNext(Integer t) {
                  // force it to be slow and wait until we have queued everything
                  try {
                      latch.await(500, TimeUnit.MILLISECONDS);
                  } catch (InterruptedException e) {
                      e.printStackTrace();
                  }
              }
  
          });
          flowable.observeOn(Schedulers.newThread()).subscribe(testSubscriber);
  
          testSubscriber.awaitTerminalEvent();
          List<Throwable> errors = testSubscriber.errors();
          assertEquals(1, errors.size());
          System.out.println("Errors: " + errors);
          Throwable t = errors.get(0);
          if (t instanceof MissingBackpressureException) {
              // success, we expect this
          } else {
              if (t.getCause() instanceof MissingBackpressureException) {
                  // this is also okay
              } else {
                  fail("Expecting MissingBackpressureException");
              }
          }
      }
  
      @Test
      public void testAsyncChild() {
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
          Flowable.range(0, 100000).observeOn(Schedulers.newThread()).observeOn(Schedulers.newThread()).subscribe(ts);
          ts.awaitTerminalEvent();
          ts.assertNoErrors();
      }
  
      @Test
      public void testOnErrorCutsAheadOfOnNext() {
          for (int i = 0; i < 50; i++) {
              final PublishProcessor<Long> subject = PublishProcessor.create();
  
              final AtomicLong counter = new AtomicLong();
              TestSubscriber<Long> ts = new TestSubscriber<Long>(new DefaultSubscriber<Long>() {
  
                  @Override
                  public void onComplete() {
  
                  }
  
                  @Override
                  public void onError(Throwable e) {
  
                  }
  
                  @Override
                  public void onNext(Long t) {
                      // simulate slow consumer to force backpressure failure
                      try {
                          Thread.sleep(1);
                      } catch (InterruptedException e) {
                      }
                  }
  
              });
              subject.observeOn(Schedulers.computation()).subscribe(ts);
  
              // this will blow up with backpressure
              while (counter.get() < 102400) {
                  subject.onNext(counter.get());
                  counter.incrementAndGet();
              }
  
              ts.awaitTerminalEvent();
              assertEquals(1, ts.errors().size());
              ts.assertError(MissingBackpressureException.class);
              // assert that the values are sequential, that cutting in didn't allow skipping some but emitting others.
              // example [0, 1, 2] not [0, 1, 4]
              List<Long> onNextEvents = ts.values();
              assertTrue(onNextEvents.isEmpty() || onNextEvents.size() == onNextEvents.get(onNextEvents.size() - 1) + 1);
              // we should emit the error without emitting the full buffer size
              assertTrue(onNextEvents.size() < Flowable.bufferSize());
          }
      }
  
      /**
       * Make sure we get a MissingBackpressureException propagated through when we have a fast temporal (hot) producer.
       */
      @Test
      public void testHotOperatorBackpressure() {
          TestSubscriber<String> ts = new TestSubscriber<String>();
          Flowable.interval(0, 1, TimeUnit.MICROSECONDS)
                  .observeOn(Schedulers.computation())
                  .map(new Function<Long, String>() {
  
                      @Override
                      public String apply(Long t1) {
                          System.out.println(t1);
                          try {
                              Thread.sleep(100);
                          } catch (InterruptedException e) {
                          }
                          return t1 + " slow value";
                      }
  
                  }).subscribe(ts);
  
          ts.awaitTerminalEvent();
          System.out.println("Errors: " + ts.errors());
          assertEquals(1, ts.errors().size());
          assertEquals(MissingBackpressureException.class, ts.errors().get(0).getClass());
      }
  
      @Test
      public void testErrorPropagatesWhenNoOutstandingRequests() {
          Flowable<Long> timer = Flowable.interval(0, 1, TimeUnit.MICROSECONDS)
                  .doOnEach(new Consumer<Notification<Long>>() {
  
                      @Override
                      public void accept(Notification<Long> n) {
  //                        System.out.println("BEFORE " + n);
                      }
  
                  })
                  .observeOn(Schedulers.newThread())
                  .doOnEach(new Consumer<Notification<Long>>() {
  
                      @Override
                      public void accept(Notification<Long> n) {
                          try {
                              Thread.sleep(100);
                          } catch (InterruptedException e) {
                          }
  //                        System.out.println("AFTER " + n);
                      }
  
                  });
  
          TestSubscriber<Long> ts = new TestSubscriber<Long>();
  
          Flowable.combineLatest(timer, Flowable.<Integer> never(), new BiFunction<Long, Integer, Long>() {
  
              @Override
              public Long apply(Long t1, Integer t2) {
                  return t1;
              }
  
          }).take(Flowable.bufferSize() * 2).subscribe(ts);
  
          ts.awaitTerminalEvent();
          assertEquals(1, ts.errors().size());
          assertEquals(MissingBackpressureException.class, ts.errors().get(0).getClass());
      }
  
      @Test
      public void testRequestOverflow() throws InterruptedException {
  
          final CountDownLatch latch = new CountDownLatch(1);
          final AtomicInteger count = new AtomicInteger();
          Flowable.range(1, 100).observeOn(Schedulers.computation())
                  .subscribe(new DefaultSubscriber<Integer>() {
  
                      boolean first = true;
  
                      @Override
                      public void onStart() {
                          request(2);
                      }
  
                      @Override
                      public void onComplete() {
                          latch.countDown();
                      }
  
                      @Override
                      public void onError(Throwable e) {
  
                      }
  
                      @Override
                      public void onNext(Integer t) {
                          count.incrementAndGet();
                          if (first) {
                              request(Long.MAX_VALUE - 1);
                              request(Long.MAX_VALUE - 1);
                              request(10);
                              first = false;
                          }
                      }
                  });
          assertTrue(latch.await(10, TimeUnit.SECONDS));
          assertEquals(100, count.get());
  
      }
  
      @Test
      public void testNoMoreRequestsAfterUnsubscribe() throws InterruptedException {
          final CountDownLatch latch = new CountDownLatch(1);
          final List<Long> requests = Collections.synchronizedList(new ArrayList<Long>());
          Flowable.range(1, 1000000)
                  .doOnRequest(new LongConsumer() {
  
                      @Override
                      public void accept(long n) {
                          requests.add(n);
                      }
                  })
                  .observeOn(Schedulers.io())
                  .subscribe(new DefaultSubscriber<Integer>() {
  
                      @Override
                      public void onStart() {
                          request(1);
                      }
  
                      @Override
                      public void onComplete() {
                      }
  
                      @Override
                      public void onError(Throwable e) {
                      }
  
                      @Override
                      public void onNext(Integer t) {
                          cancel();
                          latch.countDown();
                      }
                  });
          assertTrue(latch.await(10, TimeUnit.SECONDS));
          // FIXME observeOn requests bufferSize at first always
          assertEquals(Arrays.asList(128L), requests);
      }
  
  
      @Test
      public void testErrorDelayed() {
          TestScheduler s = new TestScheduler();
  
          Flowable<Integer> source = Flowable.just(1, 2 ,3)
                  .concatWith(Flowable.<Integer>error(new TestException()));
  
          TestSubscriber<Integer> ts = TestSubscriber.create(0);
  
          source.observeOn(s, true).subscribe(ts);
  
          ts.assertNoValues();
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          s.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertNoValues();
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          ts.request(1);
          s.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValues(1);
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          ts.request(3); // requesting 2 doesn't switch to the error() source for some reason in concat.
          s.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValues(1, 2, 3);
          ts.assertError(TestException.class);
          ts.assertNotComplete();
      }
  
      @Test
      public void testErrorDelayedAsync() {
          Flowable<Integer> source = Flowable.just(1, 2 ,3)
                  .concatWith(Flowable.<Integer>error(new TestException()));
  
          TestSubscriber<Integer> ts = TestSubscriber.create();
  
          source.observeOn(Schedulers.computation(), true).subscribe(ts);
  
          ts.awaitTerminalEvent(2, TimeUnit.SECONDS);
          ts.assertValues(1, 2, 3);
          ts.assertError(TestException.class);
          ts.assertNotComplete();
      }
  
      @Test
      public void requestExactCompletesImmediately() {
          TestSubscriber<Integer> ts = TestSubscriber.create(0);
  
          TestScheduler test = new TestScheduler();
  
          Flowable.range(1, 10).observeOn(test).subscribe(ts);
  
          test.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertNoValues();
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          ts.request(10);
  
          test.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValueCount(10);
          ts.assertNoErrors();
          ts.assertComplete();
      }
  
      @Test
      public void fixedReplenishPattern() {
          TestSubscriber<Integer> ts = TestSubscriber.create(0);
  
          TestScheduler test = new TestScheduler();
  
          final List<Long> requests = new ArrayList<Long>();
  
          Flowable.range(1, 100)
          .doOnRequest(new LongConsumer() {
              @Override
              public void accept(long v) {
                  requests.add(v);
              }
          })
          .observeOn(test, false, 16).subscribe(ts);
  
          test.advanceTimeBy(1, TimeUnit.SECONDS);
          ts.request(20);
          test.advanceTimeBy(1, TimeUnit.SECONDS);
          ts.request(10);
          test.advanceTimeBy(1, TimeUnit.SECONDS);
          ts.request(50);
          test.advanceTimeBy(1, TimeUnit.SECONDS);
          ts.request(35);
          test.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValueCount(100);
          ts.assertComplete();
          ts.assertNoErrors();
  
          assertEquals(Arrays.asList(16L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L), requests);
      }
  
      @Test
      public void bufferSizesWork() {
          for (int i = 1; i <= 1024; i = i * 2) {
              TestSubscriber<Integer> ts = TestSubscriber.create();
  
              Flowable.range(1, 1000 * 1000).observeOn(Schedulers.computation(), false, i)
              .subscribe(ts);
  
              ts.awaitTerminalEvent();
              ts.assertValueCount(1000 * 1000);
              ts.assertComplete();
              ts.assertNoErrors();
          }
      }
  
      @Test
      public void synchronousRebatching() {
          final List<Long> requests = new ArrayList<Long>();
  
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
  
          Flowable.range(1, 50)
          .doOnRequest(new LongConsumer() {
              @Override
              public void accept(long r) {
                  requests.add(r);
              }
          })
         .rebatchRequests(20)
         .subscribe(ts);
  
         ts.assertValueCount(50);
         ts.assertNoErrors();
         ts.assertComplete();
  
         assertEquals(Arrays.asList(20L, 15L, 15L, 15L), requests);
      }
  
      @Test
      public void rebatchRequestsArgumentCheck() {
          try {
              Flowable.never().rebatchRequests(-99);
              fail("Didn't throw IAE");
          } catch (IllegalArgumentException ex) {
              assertEquals("bufferSize > 0 required but it was -99", ex.getMessage());
          }
      }
  
      @Test
      public void delayError() {
          Flowable.range(1, 5).concatWith(Flowable.<Integer>error(new TestException()))
          .observeOn(Schedulers.computation(), true)
          .doOnNext(new Consumer<Integer>() {
              @Override
              public void accept(Integer v) throws Exception {
                  if (v == 1) {
                      Thread.sleep(100);
                  }
              }
          })
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class, 1, 2, 3, 4, 5);
      }
  
      @Test
      public void conditionalConsumer() {
          Flowable.range(1, 5)
          .observeOn(Schedulers.single())
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(2, 4);
      }
  
      @Test
      public void take() {
          Flowable.range(1, 5)
          .observeOn(Schedulers.single())
          .take(3)
          .take(3)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2, 3);
      }
  
      @Test
      public void cancelCleanup() {
          TestSubscriber<Integer> ts = Flowable.range(1, 5)
          .observeOn(Schedulers.single())
          .test(0L);
  
          ts.cancel();
      }
  
      @Test
      public void conditionalConsumerFused() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 5)
          .observeOn(Schedulers.single())
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .subscribe(ts);
  
          ts
          .assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.ASYNC))
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(2, 4);
      }
  
      @Test
      public void conditionalConsumerFusedReject() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.SYNC);
  
          Flowable.range(1, 5)
          .observeOn(Schedulers.single())
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .subscribe(ts);
  
          ts
          .assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.NONE))
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(2, 4);
      }
  
      @Test
      public void requestOne() throws Exception {
          TestSubscriber<Integer> ts = Flowable.range(1, 5)
          .observeOn(Schedulers.single())
          .test(1);
  
          Thread.sleep(100);
  
          ts.assertSubscribed().assertValue(1).assertNoErrors().assertNotComplete();
      }
  
      @Test
      public void requestOneConditional() throws Exception {
          TestSubscriber<Integer> ts = Flowable.range(1, 5)
          .observeOn(Schedulers.single())
          .filter(Functions.alwaysTrue())
          .test(1);
  
          Thread.sleep(100);
  
          ts.assertSubscribed().assertValue(1).assertNoErrors().assertNotComplete();
      }
  
      @Test
      public void conditionalConsumerFusedAsync() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          UnicastProcessor<Integer> up = UnicastProcessor.create();
  
          up
          .observeOn(Schedulers.single())
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .subscribe(ts);
  
          up.onNext(1);
          up.onNext(2);
          up.onNext(3);
          up.onNext(4);
          up.onNext(5);
          up.onComplete();
  
          ts
          .assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.ASYNC))
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(2, 4);
      }
  
      @Test
      public void conditionalConsumerHidden() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 5).hide()
          .observeOn(Schedulers.single())
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .subscribe(ts);
  
          ts
          .assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.ASYNC))
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(2, 4);
      }
  
      @Test
      public void conditionalConsumerBarrier() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 5)
          .map(Functions.<Integer>identity())
          .observeOn(Schedulers.single())
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .subscribe(ts);
  
          ts
          .assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.ASYNC))
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(2, 4);
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(PublishProcessor.create().observeOn(new TestScheduler()));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(new Function<Flowable<Object>, Flowable<Object>>() {
              @Override
              public Flowable<Object> apply(Flowable<Object> o) throws Exception {
                  return o.observeOn(new TestScheduler());
              }
          });
      }
  
      @Test
      public void badSource() {
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
          try {
              TestScheduler scheduler = new TestScheduler();
              TestSubscriber<Integer> to = new Flowable<Integer>() {
                  @Override
                  protected void subscribeActual(Subscriber<? super Integer> observer) {
                      observer.onSubscribe(new BooleanSubscription());
                      observer.onComplete();
                      observer.onNext(1);
                      observer.onError(new TestException());
                      observer.onComplete();
                  }
              }
              .observeOn(scheduler)
              .test();
  
              scheduler.triggerActions();
  
              to.assertResult();
  
              TestCommonHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  
      @Test
      public void inputSyncFused() {
          Flowable.range(1, 5)
          .observeOn(Schedulers.single())
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void inputAsyncFused() {
          UnicastProcessor<Integer> us = UnicastProcessor.create();
  
          TestSubscriber<Integer> to = us.observeOn(Schedulers.single()).test();
  
          TestHelper.emit(us, 1, 2, 3, 4, 5);
  
          to
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void inputAsyncFusedError() {
          UnicastProcessor<Integer> us = UnicastProcessor.create();
  
          TestSubscriber<Integer> to = us.observeOn(Schedulers.single()).test();
  
          us.onError(new TestException());
  
          to
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void inputAsyncFusedErrorDelayed() {
          UnicastProcessor<Integer> us = UnicastProcessor.create();
  
          TestSubscriber<Integer> to = us.observeOn(Schedulers.single(), true).test();
  
          us.onError(new TestException());
  
          to
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void outputFused() {
          TestSubscriber<Integer> to = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 5).hide()
          .observeOn(Schedulers.single())
          .subscribe(to);
  
          SubscriberFusion.assertFusion(to, FusedQueueSubscription.ASYNC)
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void outputFusedReject() {
          TestSubscriber<Integer> to = SubscriberFusion.newTest(FusedQueueSubscription.SYNC);
  
          Flowable.range(1, 5).hide()
          .observeOn(Schedulers.single())
          .subscribe(to);
  
          SubscriberFusion.assertFusion(to, FusedQueueSubscription.NONE)
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void inputOutputAsyncFusedError() {
          TestSubscriber<Integer> to = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          UnicastProcessor<Integer> us = UnicastProcessor.create();
  
          us.observeOn(Schedulers.single())
          .subscribe(to);
  
          us.onError(new TestException());
  
          to
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
  
          SubscriberFusion.assertFusion(to, FusedQueueSubscription.ASYNC)
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void inputOutputAsyncFusedErrorDelayed() {
          TestSubscriber<Integer> to = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          UnicastProcessor<Integer> us = UnicastProcessor.create();
  
          us.observeOn(Schedulers.single(), true)
          .subscribe(to);
  
          us.onError(new TestException());
  
          to
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
  
          SubscriberFusion.assertFusion(to, FusedQueueSubscription.ASYNC)
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void outputFusedCancelReentrant() throws Exception {
          final UnicastProcessor<Integer> us = UnicastProcessor.create();
  
          final CountDownLatch cdl = new CountDownLatch(1);
  
          us.observeOn(Schedulers.single())
          .subscribe(new RelaxedSubscriber<Integer>() {
              Subscription d;
              int count;
              @Override
              public void onSubscribe(Subscription d) {
                  this.d = d;
                  ((FusedQueueSubscription<?>)d).requestFusion(FusedQueueSubscription.ANY);
              }
  
              @Override
              public void onNext(Integer value) {
                  if (++count == 1) {
                      us.onNext(2);
                      d.cancel();
                      cdl.countDown();
                  }
              }
  
              @Override
              public void onError(Throwable e) {
  
              }
  
              @Override
              public void onComplete() {
  
              }
          });
  
          us.onNext(1);
  
          cdl.await();
      }
  
      @Test
      public void nonFusedPollThrows() {
          new Flowable<Integer>() {
              @Override
              protected void subscribeActual(Subscriber<? super Integer> observer) {
                  observer.onSubscribe(new BooleanSubscription());
  
                  @SuppressWarnings("unchecked")
                  BaseObserveOnSubscriber<Integer> oo = (BaseObserveOnSubscriber<Integer>)observer;
  
                  oo.sourceMode = FusedQueueSubscription.SYNC;
                  oo.requested.lazySet(1);
                  oo.queue = new FusedQueue<Integer>() {
  
                      @Override
                      public boolean offer(Integer value) {
                          return false;
                      }
  
                      @Nullable
                      @Override
                      public Integer poll() throws Exception {
                          throw new TestException();
                      }
  
                      @Override
                      public boolean isEmpty() {
                          return false;
                      }
  
                      @Override
                      public void clear() {
                      }
                  };
  
                  oo.clear();
  
                  oo.trySchedule();
              }
          }
          .observeOn(Schedulers.single())
          .test(0L)
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void conditionalNonFusedPollThrows() {
          new Flowable<Integer>() {
              @Override
              protected void subscribeActual(Subscriber<? super Integer> observer) {
                  observer.onSubscribe(new BooleanSubscription());
  
                  @SuppressWarnings("unchecked")
                  BaseObserveOnSubscriber<Integer> oo = (BaseObserveOnSubscriber<Integer>)observer;
  
                  oo.sourceMode = FusedQueueSubscription.SYNC;
                  oo.requested.lazySet(1);
                  oo.queue = new FusedQueue<Integer>() {
  
                      @Override
                      public boolean offer(Integer value) {
                          return false;
                      }
  
                      @Nullable
                      @Override
                      public Integer poll() throws Exception {
                          throw new TestException();
                      }
  
                      @Override
                      public boolean isEmpty() {
                          return false;
                      }
  
                      @Override
                      public void clear() {
                      }
                  };
  
                  oo.clear();
  
                  oo.trySchedule();
              }
          }
          .observeOn(Schedulers.single())
          .filter(Functions.alwaysTrue())
          .test(0L)
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void asycFusedPollThrows() {
          new Flowable<Integer>() {
              @Override
              protected void subscribeActual(Subscriber<? super Integer> observer) {
                  observer.onSubscribe(new BooleanSubscription());
  
                  @SuppressWarnings("unchecked")
                  BaseObserveOnSubscriber<Integer> oo = (BaseObserveOnSubscriber<Integer>)observer;
  
                  oo.sourceMode = FusedQueueSubscription.ASYNC;
                  oo.requested.lazySet(1);
                  oo.queue = new FusedQueue<Integer>() {
  
                      @Override
                      public boolean offer(Integer value) {
                          return false;
                      }
  
                      @Nullable
                      @Override
                      public Integer poll() throws Exception {
                          throw new TestException();
                      }
  
                      @Override
                      public boolean isEmpty() {
                          return false;
                      }
  
                      @Override
                      public void clear() {
                      }
                  };
  
                  oo.clear();
  
                  oo.trySchedule();
              }
          }
          .observeOn(Schedulers.single())
          .test(0L)
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void conditionalAsyncFusedPollThrows() {
          new Flowable<Integer>() {
              @Override
              protected void subscribeActual(Subscriber<? super Integer> observer) {
                  observer.onSubscribe(new BooleanSubscription());
  
                  @SuppressWarnings("unchecked")
                  BaseObserveOnSubscriber<Integer> oo = (BaseObserveOnSubscriber<Integer>)observer;
  
                  oo.sourceMode = FusedQueueSubscription.ASYNC;
                  oo.requested.lazySet(1);
                  oo.queue = new FusedQueue<Integer>() {
  
                      @Override
                      public boolean offer(Integer value) {
                          return false;
                      }
  
                      @Nullable
                      @Override
                      public Integer poll() throws Exception {
                          throw new TestException();
                      }
  
                      @Override
                      public boolean isEmpty() {
                          return false;
                      }
  
                      @Override
                      public void clear() {
                      }
                  };
  
                  oo.clear();
  
                  oo.trySchedule();
              }
          }
          .observeOn(Schedulers.single())
          .filter(Functions.alwaysTrue())
          .test(0L)
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void trampolineScheduler() {
          Flowable.just(1)
          .observeOn(Schedulers.trampoline())
          .test()
          .assertResult(1);
      }
  
      @Test
      public void conditionalNormal() {
          Flowable.range(1, 1000).hide()
          .observeOn(Schedulers.single())
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .take(250)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertSubscribed()
          .assertValueCount(250)
          .assertNoErrors()
          .assertComplete();
      }
  
      @Test
      public void syncFusedCancelAfterRequest() {
          final TestSubscriber<Integer> ts = new TestSubscriber<Integer>(2L) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  if (t == 2) {
                      cancel();
                      onComplete();
                  }
              }
          };
  
          Flowable.range(1, 3)
          .observeOn(Schedulers.single())
          .subscribe(ts);
  
          ts
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2);
      }
  
      @Test
      public void syncFusedCancelAfterRequest2() {
          final TestSubscriber<Integer> ts = new TestSubscriber<Integer>(2L);
  
          Flowable.range(1, 2)
          .observeOn(Schedulers.single())
          .subscribe(ts);
  
          ts
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2);
      }
  
      @Test
      public void syncFusedCancelAfterRequestConditional() {
          final TestSubscriber<Integer> ts = new TestSubscriber<Integer>(2L) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  if (t == 2) {
                      cancel();
                      onComplete();
                  }
              }
          };
  
          Flowable.range(1, 3)
          .observeOn(Schedulers.single())
          .filter(Functions.alwaysTrue())
          .subscribe(ts);
  
          ts
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2);
      }
  
      @Test
      public void syncFusedCancelAfterRequestConditional2() {
          final TestSubscriber<Integer> ts = new TestSubscriber<Integer>(2L);
  
          Flowable.range(1, 2)
          .observeOn(Schedulers.single())
          .filter(Functions.alwaysTrue())
          .subscribe(ts);
  
          ts
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2);
      }
  
      @Test
      public void nonFusedCancelAfterRequestConditional2() {
          final TestSubscriber<Integer> ts = new TestSubscriber<Integer>(2L);
  
          Flowable.range(1, 2).hide()
          .observeOn(Schedulers.single())
          .filter(Functions.alwaysTrue())
          .subscribe(ts);
  
          ts
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2);
      }
  
      @Test
      public void doubleObserveOn() {
          Flowable.just(1).hide()
          .observeOn(Schedulers.computation())
          .observeOn(Schedulers.single())
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1);
      }
  
      @Test
      public void doubleObserveOnError() {
          Flowable.error(new TestException())
          .observeOn(Schedulers.computation())
          .observeOn(Schedulers.single())
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void doubleObserveOnConditional() {
          Flowable.just(1).hide()
          .observeOn(Schedulers.computation())
          .distinct()
          .observeOn(Schedulers.single())
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1);
      }
  
      @Test
      public void doubleObserveOnErrorConditional() {
          Flowable.error(new TestException())
          .observeOn(Schedulers.computation())
          .distinct()
          .observeOn(Schedulers.single())
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void request1Conditional() {
          Flowable.range(1, 10).hide()
          .observeOn(ImmediateThinScheduler.INSTANCE)
          .filter(Functions.alwaysTrue())
          .test(1L)
          .assertValue(1);
      }
  
      @Test
      public void backFusedConditional() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 100).hide()
          .observeOn(ImmediateThinScheduler.INSTANCE)
          .filter(Functions.alwaysTrue())
          .subscribe(ts);
  
          SubscriberFusion.assertFusion(ts, FusedQueueSubscription.ASYNC)
          .assertValueCount(100)
          .assertComplete()
          .assertNoErrors();
      }
  
      @Test
      public void backFusedErrorConditional() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.<Integer>error(new TestException())
          .observeOn(ImmediateThinScheduler.INSTANCE)
          .filter(Functions.alwaysTrue())
          .subscribe(ts);
  
          SubscriberFusion.assertFusion(ts, FusedQueueSubscription.ASYNC)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void backFusedCancelConditional() {
          for (int i = 0; i < 500; i++) {
              final TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
              final TestScheduler scheduler = new TestScheduler();
  
              Flowable.just(1).hide()
              .observeOn(scheduler)
              .filter(Functions.alwaysTrue())
              .subscribe(ts);
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ts.cancel();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      scheduler.triggerActions();
                  }
              };
  
              TestCommonHelper.race(r1, r2);
  
              SubscriberFusion.assertFusion(ts, FusedQueueSubscription.ASYNC);
  
              if (ts.valueCount() != 0) {
                  ts.assertResult(1);
              }
          }
      }
  
      @Test
      public void syncFusedRequestOneByOneConditional() {
          Flowable.range(1, 5)
          .observeOn(ImmediateThinScheduler.INSTANCE)
          .filter(Functions.alwaysTrue())
          .rebatchRequests(1)
          .test()
          .assertResult(1, 2, 3, 4, 5);
      }
  }
  